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The tv power supply board have dying parts call the capacitors.These capacitors are dying and have leaking gases.These dying capacitors are alway bulges up on it tops or puffing up on it tops.The power supply board the board that the board,where the power a/c cord plug into it.U have tools like a soldering iron,desoldering pump or desoldering braids,solders?U can do basic soldering?U have basic understanding of electronic?Replaced these dying and leaking gases capacitors,that are bulging up on it tops or puffing up on it tops.This sporadic turn off and on will stop.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

The Lg you have actually has three boards that can cause the problem you are talking about. The control board, the y-board or the z-board. Usually most technicians will change the y-board and z board together since it is usually a combination of both that cause the problem. The control board by itself can cause the problem. The part #'s are as follows and these are straight from the LG plasma tv training manuals. 1- Control board 6871QCH053G, 2- Y board 6871QYH036D, and the Z-board is
6871QZH041B. The boards can be checked by looking at the voltages and signals but as I said some of those problems for no picture interrelate between boards. Hope this helped. Also with the back cover off those boards are clearly marked. The y board is a small board on the left and the Z board is on the right. The control board is of course in between them. They have tiny white stickers with the part # and assy# on them an also directly on the board itself. Always disconnect the power cord when looking at the inside by taking the back cover off.